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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364cf31219c12d2a577271564ae32a4051f52f32489117469195cdf8c3e73f6c' 
  AND token = 'H5puqjMwzjo9Ou5apnxjtolnC812BT2dq7UsMWpOdwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}